Terminal, Base Station, and Communication Method for Reference Signals with Phase Shift Indexes

2. The terminal according to claim 1, wherein the signal is comprised of a plurality of sequences that are mapped to the plurality of frequency resources, respectively, and the circuitry, in operation, generates the signal using the plurality of cyclic shift indexes for the plurality of sequences, respectively.

3. The terminal according to claim 2, wherein each of the plurality of sequences has a sequence length corresponding to one of the plurality of frequency resources.

4. The terminal according to claim 1, wherein the plurality of cyclic shift indexes associated with the plurality of frequency resources are different from each other.

5. The terminal according to claim 1, wherein the circuitry, in operation, generates the signal based on a cyclic shift index obtained by adding the another cyclic shift index to the plurality of cyclic shift indexes that are associated with the plurality of frequency resources, respectively.

6. The terminal according to claim 1, wherein the another cyclic shift index is provided from a base station.

7. The terminal according to claim 1, wherein the plurality of frequency resources are inconsecutive in a frequency domain.

8. The terminal according to claim 1, wherein the plurality of frequency resources are apart from each other with an interval.

9. The terminal according to claim 1, wherein the plurality of cyclic shift indexes are uniquely associated with the plurality of frequency resources, respectively.

11. The communication method according to claim 10, wherein the signal is comprised of a plurality of sequences that are mapped to the plurality of frequency resources, respectively, and the generating includes generating the signal using the plurality of cyclic shift indexes for the plurality of sequences, respectively.

12. The communication method according to claim 11, wherein each of the plurality of sequences has a sequence length corresponding to one of the plurality of frequency resources.

13. The communication method according to claim 10, wherein the plurality of cyclic shift indexes associated with the plurality of frequency resources are different from each other.

14. The communication method according to claim 10, wherein the generating includes generating the signal based on a cyclic shift index obtained by adding the another cyclic shift index to the plurality of cyclic shift indexes that are associated with the plurality of frequency resources, respectively.

15. The communication method according to claim 10, wherein the another cyclic shift index is provided from a base station.

16. The communication method according to claim 10, wherein the plurality of frequency resources are inconsecutive in a frequency domain.

17. The communication method according to claim 10, wherein the plurality of frequency resources are apart from each other with an interval.

18. The communication method according to claim 10, wherein the plurality of cyclic shift indexes are uniquely associated with the plurality of frequency resources, respectively.